Felted asbestos product



May 7, 1935. w.- D. PARDOE FELTED ASBESTOS PRODUCT Filed Jan. 11', 1953 Patented May 7, 1935 UNITED STATES PATENT OFFICE FELTED ASBESTOS PRODUCT William D. Pardoe, Lawrenceville, N. J., asslgnor to Thermoid Rubber Company, Trenton, N. 3., a corporation of New Jersey Application January 11, 1933, Serial No. 651,079

8 Claims. (Cl. 154-49) The principal object of this invention is to prothe felted mass a body which it otherwise lacks vide an improved heat-insulating material in the and producing a stronger interlock or bond beform of felted fabric, said material being adapted tween the fibres of the bat and the base fabric. for general insulation purposes and being well The resultant product is well suited for many suited for use as a wear-resisting and heatinsulating purposes and has sufficient inherent 5 insulating mat for the floors of automobiles. strength and wear-resisting properties to permit While it has previously been proposed to form its being used in places in whichit is subjected felted fabrics incorporating asbestos, no fabric of to considerable wear. For use as a fioor covering, this type has been produced commercially having however, where the wear placed upon the product 10 sufficient inherent strength and durability to peris heavy, I preferto coat one or both sides of the 10 mit its use as a floor covering or in places where it I product previously described with rubber which is subjected to any substantial wear. subsequently is vulcanized, this vulcanized rubber The insulating properties of asbestos products forming a surface on one or both sides of the of all sorts is well understood, but asbestos felts, fabric which is well able to withstand considerable due to their lack of strength and lack of resistance heavy frictional wear preventing disintegration of 5 to wear have necessarily been restricted to uses the fabric under heavy use. When thus provided where these characteristics are not essential I with a rubber surface, the product loses none of have discovered means for producing an asbestos its insulating properties and is thereby well felted product having considerably greater resistadapted for use on the floors of automobiles where ance to wear than the prior products of like it is desired to insulate the interior of the auto- 20 general character; and more specifically, I have mobile body from the heat generatedunder the produced a floor covering well adapted for use hood and behind the fioor boards. in automobiles which utilizes for the first time in Instead of a surface coating of vulcanized ruban article of this character the relatively high her, I may employ other wear-resisting binders insulating properties of asbestos. applied either to the surface or impregnating the 25 In accordance with my invention, I first proentire fabric. Imay, for example, run the fabric duce on cards or garnetts a bat or lap of clean through a solution of starch or sodium silicate to asbestos fibre, this bat or lap being of any desired give the fabric the necessary strength and duraweight and thickness. While I prefer to employ bility to withstand abrasive wear without disinasbestos fibres alone in the production of this bat, tegration. a it will be apparent that varying percentages of In the attached drawing: hair, jute or other suitable fibers may be intro- Figure 1 is an edge view of the bat representing duced if desired without departure from the inan initial step in the manufacture of my improved vention. product;

I now treat the bat or lap produced as described Fig. 2 is a similar view showing the bat treated above by spraying or impregnating it with a thin in accordance with the second step of my process; solution of rubber latex, rubber cement or other Fi 3 is a like view showing the finished prodsuitable binder preferably possessing water- 1;; proofing characteristics. Rubber latex solution Fig 4 Shows a further embodiment of my i has been found well suited for this purpose and tion, wherein as previously described the article a 30% soluticm has been found Satisfactory is coated on one side with rubber or other sur- The treated bat after being dried is then passed facing material, and thmugh a needle Punching Similar Fig. 5 shows the product of Fig.3 provided with chine together with a woven base fabric, the fibres a rubber or other surface Onboth sides of the bat being forced in this operation into with rference to Fig. 3 the base fabric with a and through the fabric so that the lap 15 h th b t Sh F1 2 is comb. ed as thoroughly incorporated and mechanically bondw e t d ed with the fabric and forms on the surface of prevlously descflbed l e y 6 re erthe latter a felted mass of the asbestos fibres ance numeral f m Flgs- 4 and 51 the refer interlocked with the strands of the base fabric. ence numfaral 2 mdlcates the rubber or other Many different kinds of base fabric may be emace coating. ployed, although I prefer to use a fabric of woven I 019M113 asbestos. I have found that rubber latex or other i. As a new article of manufacture, a felted asbinder used on the fibres has the effect of matebestos product consisting of a base fabric and 55 rially strengthening the r su ta fabric iving fibres of asbestos coated with a plastic binder and 55 mechanically interlocked with and overlyins a face of said fabric.

2. As a new article of manufacture. a felted asbestos product consisting of a base fabric and latex-coated fibres of asbestos interlocked with and overlying a face of said fabric.

3. As a new article of manufacture, a felted asbestosprcduct consisting of a base fabric and a bat of asbestos fibres impregnated with a plastic binder and interlocked with said fabric.

4. As a new article of manufacture, a felted asbestosjproduct consisting of a base fabric of woven asbestos and a rubber-impregnated bat of asbestos fibres mechanically interlocked with said fabric.

5. As a new article of manufacture. a felted as bestos product consisting of a reinforcing base fabric, a bat of asbestos fibres overlying a face of and interlocked with said fabric. and a plastic binder bonding the fibres of said bat together and to the base fabric.

6. As a new article of manufacture, a felted asbestos product consisting of a base fabric, fibres of asbestos interlocked with and overlying a face of said fabric. and a surface of cured rubber bonded with said fibres and forming a wear-resisting 7. As a new article of manufacture. a flexible rubber mat having secured to one side thereof a felted asbestos product consisting of a base fabric and asbestos fibres mechanically interlocked with said fabric.

- 8.- A floor covering comprising a felted asbestos sheet and a flexible rubber wearing surface.

WILLIAMED. PARDOE. 

